Chapter 34.1, Problem 1NV

Summary Introduction

To fill:

The correct terms according to the given blanks.

Answer to Problem 1NV

The given blanks can be filled as follows:

S. no.	Correct term
1	Artery
2	Capillaries
3	Veins
4	Valves
5	Heart
6	Pacemaker
7	Plasma
8	Red blood cells
9	White blood cells
10	Platelets
11	Atherosclerosis

Explanation of Solution

The circulatory system of the body is made up of the heart and the blood vessels. Blood vessels that carry oxygenated blood from the heart to the body are called arteries. Nearby tissue arteries are diverged to form a microscopic tubular network called capillaries. The capillaries are the site where the exchange of the gases between tissue and blood takes place.

The capillaries join to form veins, in the veins, the deoxygenated blood is present, in veins, the blood pressure is not high so, it has valves to prevent the backflow of the blood. The veins deliver the blood in the heart and the heart pumps the blood throughout the body. It is a hollow muscular organ. The pacemaker of the heart that is present in the right atrium sends the signal to the heart for pumping the blood.

The blood is the fluid connective tissue which is composed of plasma, white blood cells, red blood cells, platelets, and proteins. The plasma is a clear yellowish fluid that comprises more than 50% of blood. The function of the red blood cells is to transfer the oxygen from the heart to the body. The white blood cells are the cells responsible for immunity and the body’s disease fighting capability. The fragments of the cells that help in blood clotting are known as platelets. The blood clots, fats and other components of blood cause a block to artery resulting in a condition called atherosclerosis.